FN 3

Brake Caliper Piston

Special tools, testers and auxiliary items required

• Trim removal wedge (3409)

• Piston resetting tool (T 10145)

• Disk (T 10146/6)

Removing

- Force the piston from the brake caliper using compressed air.

Place a wooden board into the recess of the caliper housing so it is not damaged.





- Remove the protective cap from the brake caliper using trim removal wedge (3409).





- Remove the seal using trim removal wedge (3409 ).





When removing, make sure that surface of cylinder is not damaged.

Installing

- The surface of the piston and seal must only be cleaned with mineral spirits and then dried.

- Thinly coat piston and seal with assembly paste ( G 052 150 A2) before installing.

- Install seal into the brake caliper.

- Insert the protective cap - A - into the disk (T 10146/6) - 1 -.





- Press the protective cap with the disk (T 10146/6 ) - 1 - and the piston resetting tool (T 10145) - 2 - into the brake caliper so that it contacts the brake caliper all around.





Check Seating of Protective Caps

- Protective cap must no longer be able to be pulled from brake caliper by hand.





- Press the piston lightly against the protective cap and lock it into position, using the trim removal wedge (3049) - 2 -.





Do not angle piston, to avoid damaging the seal sleeve.

- Blow the protective cap on with pressurized air (max. 3 bar) - 1 -. Protective cap springs on to piston.

- Press piston into brake caliper using piston resetting tool (T 10145) - 1 -.





Outer sealing lip of protective cap will then engage in piston groove.